Expert Evidence at Trials (ON)This practice note discusses the admissibility and use of expert evidence in a family law proceeding in Ontario. It covers topics including the experts' duty to the court; difference between litigation experts, joint litigation experts and participant experts; expert opinions, findings and reports; test for admissibility of expert evidence and how to adduce expert evidence at trial; and common types of evidence such as hearsay, statistical evidence, novel or contested science, social science, surveillance evidence, evidence of a deceased expert, and hypothetical questions.